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Service bulletins for the 2019 Audi Q8

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

1366 on file from NHTSA, as of 2026-10-19.

About P0420 on the 2019 Audi Q8: what the code means, and the bulletins and recalls about the same components.

By type

By component

By trouble code

Only bulletins with trouble code: P0420 are shown. Show all

Bulletins, newest first
AVin4Pin202404042024-05-07. Service bulletin. UNKNOWN OR OTHER. Noise from front door trim panel while driving Air suspension warning - DTC P089200 charge handle doesn't release vehicle will not charge Corrosion on wheelhouse cover plate P008700 - low fuel pressure P042000: Catalyst System,Bank1 Efficiency Below U060B00 - no com to G31 boost pressure sensor Airbag light on, DTCs B101704, B103604 Wind noise from front doors at highway speeds
AVin4Pin202404032024-05-07. Service bulletin. UNKNOWN OR OTHER. Noise from front door trim panel while driving Air suspension warning - DTC P089200 charge handle doesn't release vehicle will not charge Corrosion on wheelhouse cover plate P008700 - low fuel pressure P042000: Catalyst System,Bank1 Efficiency Below U060B00 - no com to G31 boost pressure sensor Airbag light on, DTCs B101704, B103604 Water intrusion from sunroof Wind noise from front doors at highway speeds
AVIN4PIN202403052024-04-05. Service bulletin. EQUIPMENT:ELECTRICAL; UNKNOWN OR OTHER; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:ENGINE COOLANT HOSES AND FITTINGS; STRUCTURE:BODY:DOOR. Noise from front door trim panel while driving Low coolant warning in cluster, coolant level is correct Front window inoperative Air suspension warning - DTC P089200 charge handle doesn't release vehicle will not charge Temp sensor DTC P218500 Corrosion on wheelhouse cover plate P008700 - low fuel pressure P042000: Catalyst System, Bank1 Efficiency Below
AVIN4PIN202311102023-12-07. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Noise from front door trim panel while driving Noise from front door trim panel while driving Low coolant warning in cluster, coolant level is correct Check engine lamp is on, DTC (s) P010600, P023600, P023700, P023800 3.0L engine sound generator malfunctioning Fuel pressure low. DTC P008700 "Check engine lamp on, DTC P042000: Catalyst System,Bank1 Efficiency Below Front window inoperative Air suspension warning - DTC P089200 charge handle doesn't release vehicle will not charge Coolant leak from expansion tank noise from belt tensioner damper coolant reservoir cap broken Coolant pump leaking 48V BSG DTC U046900 / 36564: Invalid Data Received from Starter/Generator
AVIN4PIN202311202023-12-07. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. Noise from front door trim panel while driving Noise from front door trim panel while driving Low coolant warning in cluster, coolant level is correct Check engine lamp is on, DTC (s) P010600, P023600, P023700, P023800 3.0L engine sound generator malfunctioning Fuel pressure low. DTC P008700 "Check engine lamp on, DTC P042000: Catalyst System,Bank1 Efficiency Below Front window inoperative Air suspension warning - DTC P089200 charge handle doesn't release vehicle will not charge Coolant leak from expansion tank noise from belt tensioner damper coolant reservoir cap broken Coolant pump leaking Wheel speed sensor DTC C101AF1;C101BF1;C101CF1;C101DF1
AVIN4PIN202310012023-11-06. Service bulletin. FUEL SYSTEM, GASOLINE; ELECTRICAL SYSTEM; STRUCTURE:BODY:DOOR; ENGINE AND ENGINE COOLING; SUSPENSION. 3.0L engine sound generator malfunctioning Air suspension warning - DTC P089200 charge handle doesn't release Check engine lamp is on, DTC (s) P010600, P023600, P023700, P023800 "Check engine lamp on, DTC P042000: Catalyst System, Bank1 Efficiency Below" Coolant leak from expansion tank Corrosion inside door module Fuel pressure low. DTC P008700 Leak from oil pan Low coolant warning in cluster, coolant level is correct Noise from belt tensioner damper Noise from front door trim panel while driving Vehicle will not charge
AVin4Pin202309012023-10-05. Service bulletin. UNKNOWN OR OTHER; STRUCTURE:BODY:DOOR; ENGINE AND ENGINE COOLING:COOLING SYSTEM. Noise from front door trim panel while driving Low coolant warning in cluster, coolant level is correct Check engine lamp is on, DTC (s) P010600, P023600, P023700, P023800 Leak from oil pan USB Trim detached from center console 3.0L engine sound generator malfunctioning Valve cover leaking oil Fuel pressure low. DTC P008700 Check engine lamp, Belt Starter Generator DTC U046900 symptom 26950 "Check engine lamp on, DTC P042000: Catalyst System,Bank1 Efficiency Below"
AVin4PinAug232023-09-01. Service bulletin. STRUCTURE; ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM; POWER TRAIN; EQUIPMENT. 3.0L engine sound generator malfunctioning Belt noise from starter generator Check engine lamp - DTC P240200 stored in ECM Check engine lamp is on, DTC (s) P010600, P023600, P023700, P023800 "Check engine lamp on, DTC P042000: Catalyst System,Bank1 Efficiency Below" Check engine lamp, Belt Starter Generator DTC U046900 symptom 26950 Fuel pressure low. DTC P008700 Leak from oil pan Low coolant warning in cluster, coolant level is correct MMI screen exhibits "ghost touches" randomly changing screen Noise from front door trim panel while driving USB Trim detached from center console Valve cover leaking oil

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.